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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb7a05bac55c4ebd1ce2de38b65a2d86c69a9cbce5048362d09334064f7469c' 
  AND token = 'C1I8Qm4M+4I8NdsK64PRe8vkH9gEGD5/UZXL9TBx5eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}